This circuit was found in a 90s Electronic Engineering. The circuit has the tube's critical element. Operational amplifiers support equivalents.
Using a CA3130, we found this circuit in an English publication from 1977. The circuit must use a...
We found this circuit in a 1980 documentation. The flasher uses 3 transistors in the configuration of an...
This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site....